Something of this kind must have happened to me now. Preoccupied as I was, by the condition of the patient, the professional habit of rapid and close observation caused me to direct a searching glance at the man before me. It was only a brief glance⁠—for Mr. Weiss, perhaps embarrassed by my keen regard of him, almost immediately withdrew into the shadow⁠—and my attention seemed principally to be occupied by the odd contrast between the pallor of his face and the redness of his nose and by the peculiar stiff, bristly character of his eyebrows. But there was another fact, and a very curious one, that was observed by me subconsciously and instantly forgotten, to be revived later when I reflected on the events of the night. It was this: